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24 pansy plug plants ONLY £3.99 with any order

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Ceratophyllum demersum (Oxygenating Aquatic)Hornwort

Just £16.99

Hardy Perennial
What is Hardy Perennial?
A plant that lives for more than two years.
Capable of withstanding outdoor winter temperatures down to -15C.
5 ceratophyllum plants £16.99 Despatch: by end of September 2018
Please note: This product cannot be delivered outside the United Kingdom.
Description How to Grow More Info Delivery
This submerged aquatic perennial is an invaluable oxygenator. Ceratophyllum demersum is capable of growing at great depth which makes it particularly useful for oxygenating deep ponds and lakes. The long stems of feathery foliage float freely in the water unless anchored with weights to keep it in the desired location. Commonly known as Hornwort, it has the ability to take up nutrients quickly, making it an excellent competitor with algae. Height and spread: 100cm (39"). Planting depth: Zones 3 & 4 to 2m below water level.

Water Garden


Sun or semi shade

Up to 100cm (39.4in)

Up to 100cm (39.4in)

Easy for all

Easy for all

Thompson & Morgan strives to ensure that all its plants are delivered to you in the perfect condition for planting. Sadly, the time it takes to deliver to certain locations in the UK means that we can't guarantee this, so regretfully we are unable to ship live plants to the following areas: GY, HS, IV41-IV49, IV51, IV55-56, KW15-KW17, PA34, PA41-48, PA60-PA78, PA80, PH40-PH44, TR21-TR25, ZE1-ZE3.

5 ceratophyllum plants (T78127)

Flowering Months
Hornwort grows vigorously. Remove any excess growth when necessary. No other maintenance is required.
Hornwort is easy to introduce to ponds. Simply cast bunches of stems into water of depths up to 2m where it will float freely. However if it is preferred in a particular location then adding weights to the bunches will help to anchor it in place. Ceratophyllum grows well in sun or shade.


Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

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Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

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